Reflector



V 1,626,498 April 1927" P. s. BAILEY REFLECTOR Filed Sept. 23, 1924Inventor":

Percg S. Bailey,

His Attotneg.

particular -to a type which is Patented Apr. 26, 1927.

PERCY s. BAILEY,

. nnrrncroa;

Application filed September 23,1924. $eria1No.'739,429.

My invention relatesto reflectors andjin especially adaptedfor streetlighting.

Reflectors for street lighting are very often made round so that theyspread out wheel-like. -These reflectors 'are'sometimes provided withradial wave-like convolutions for the purpose of diffusing the light.

Reflectors of this type give a'general uniform distribution of lightabout the axis of the reflector. Sometimes, however, it is desirable toconstruct the reflector so as to intensify the light in one ormore zonesor areas. I have found that this can be Very effectively done by formingsections on opposite sides of the reflector into paraboloidal orellipsoidal surfaces the axes of which may be at right angles to orsloping,

with respect to the axis of the reflector. If asymmetric lightdistribution is desired the paraboloidal or ellipsoidal surfaces may beconfined to one side of the reflectors or these surfaces may beasymmetrically distributed with respect to the axis of the reflector. v

The character of the invention, however, will be more clearly understoodby referring to the accompanying drawing in which Fig. 1 shows one formof the reflector in elevation and partly in section; Fig. 2 is a planView of the reflector of Fig. 1; Fig. 3 is a side View of the reflectorof Fig. 2; Fig. 4 is a diagrammatic illustration of the lightdistribution with a form of reflector in which the axes of the majorcorrugations,

such as shown in Fig. 1, slope with respect to each other. In thisfigure the curve represents the distribution of the initial candle powerin a maximum vertical plane.

Referring more in detail to the drawings, it will be seen that thereflector has a central hood or dome section 2 with a collar 3 aboutwhich collar the reflector may be held by means of any suitable support.From the lower point of the hood the reflector flares out to form thewebs 4 and 5. As shown in the drawings these webs are provided withradial waves. These waves may be conical focalizing surfaces. However,these may also be plain flat surfaces. In between the sections 4 and 5the reflector is formed into paraboloidal surfaces 6 and 7 having acommon focal point F at which the light. source L is located. Theseparaboloidal sections may be located in anysuitable position.

" ice.- A

OF'MARIBLEHEAD, MASSACHUSETTS, ASSIGNOR TO GENERAL ELEoi For example,the axes may lie 1n a common line across the central axis A',A of thereflector. 1011 the other I hand, theaxes of these paraboloidal sectionsmay slope with respect to "the central axls asindicated in Fig.1.:Therefore the axes may lie'in a plane through the central axis A or onemay lie in one plane through the central axis A and another may lie in adifferent plane. through the axis'A. In Fig.1 the axes ofthetWo-paraboloidal sections are represented as'being in a common verticalplane but sloping with respect to the axis A It is also possible to havethe axis'of one paraboloidal section inclinedto the A axis at adifferent angle from the axis ofthe otherparaboloidal section. It

will be seen therefore that each of the paraboloidal surface-sintercepts a 'comparativeare contemplated which fall within the' scopeof the claims herein;

What I claim as new and by Letters Patent of the United States,1s

desire to secure 1. A reflector having a pair of surfaces of revolution,each surface produced by ro-' tating a conic about an axis crossing thecentral axis of the reflector, said surfaces connected on one side by areflector having a series of corrugations each in the form of a ,3.

focalizing surface generated about an axis,

the axes of such corrugations making each the same angle with the axisof the reflector,

said surfaces being also connected on the opposite slde by a reflectorhaving a series of corrugations similar to those on the opposite side,the axes of said last corrugations also making each the same angle withthe axis of the reflector.

2. A reflector having a pair of surfaces of revolution, each surfaceproduced by rotat ing a conic about an axis crossing the'central axis ofthe reflector, said surfaces connected by corrugated reflectors, onelocated between the surfaces of revolution,and on one side oftheir axisand'the other on the and other side of the surfaces of revolution, theprojection of the reflector upon a plane at right anglesto the axisof'the reflector covering a circular area, each connecting surfacehaving a multiplicity of corrugations in the form of a focalizingsurface about an axis, all of'said axes lying in a cone Surface the axisof the cone and the axis of the reflector being co-incident.

3. A reflector formed with a series ofcor rugations, said corrugationseach being in thew-form of a focali'zmg surface generated.

about an axis, all of said axesv radiating froma common point in theaxis of the reflector, only two 'ofsaid surfaces, being'of majorproportions and the remainder of-said surfaces being ofminorproportions, the:

axes of all of the corrugations being located in a cone surface, theaxis of which is coincident With-the. axis of the. reflector.

4. ,A reflector formed wlth a serles of corrugationasaid corrugationseach being in o the form of a focalizing surface generated about an"axis, flllf Of'SalCl axes" radiating from a common point'in the axis ofthe reflector, only two of said surfaces being of major proportions andthe remainder of said axes of the major corrugations slopingwith respectto each other;

, In'witness. whereof, Ihav'e hereunto set my hand this 20th day'ofSeptember -1924;

PERCY S. BAILEY.

